//C12.9:placenew2.cpp -- new, palcemen new , no delete
#include <iostream>
#include <string>
#include <new>

using namespace std;
const int BUF = 512;

class JustTesting
{
    string words;
    int number;
    public:
        JustTesting(const string &s = "Just Testing", int n = 0)
        {
            words = s;
            number = n;
            cout << words <<" constructed\n";
        }

        ~JustTesting()
        {
            cout << words << " destroyed\n";
        }
        void Show() const
        {
            cout << words << ", " << number << endl;
        }
};

int main(void)
{
    char * buffer = new char[BUF];    // g et a block of memory
    JustTesting *pc1, *pc2;
    pc1 = new (buffer)JustTesting;   // place object in buffer
    pc2 = new JustTesting("Heap1", 20);    // place object on heap

    cout << "Memory block address:\n" << "buffer: "
         << (void*)buffer << "    heap: " << pc2 << endl;
    cout << "Memory contents:\n";
    cout << pc1 << ": ";
    pc1->Show();
    cout << pc2 << ": ";
    pc2->Show();

    JustTesting *pc3, *pc4;
    // fix placement new location
    pc3 = new (buffer + sizeof(JustTesting)) JustTesting("Better Idea", 6);
    pc4 = new JustTesting("Heap2", 10);

    cout << "Memory  constents:\n";
    cout << pc3 << ": ";
    pc3->Show();

    cout << pc4 << ": ";
    pc4->Show();

    delete pc2;        // free Heap1
    delete pc4;        // free Heap2
    // explicitly destroy placement new object
    pc3->~JustTesting();    // destroy object pointer to by pc3
    pc1->~JustTesting();    // destroy object pointer to by pc1
    delete [] buffer;       // free buffer
    cout << "Done\n";
}